Spinning pot



fin edst tcs Patent 4 SPINNIN GPOT s Bernardus Genrdesfllreda,Netherlands, assignor to American Enka Corporation, Enka, N.C., acorporation of Delaware Application february 11, 1957, Serial No. 632554I '1 e (Ct-5H0 Thisinvention relates in generalto' a spinning pot usedin the manufacture of synthetic yarn and more particularly to animproved buffer ring and its attachment to the top rim of said spinningpot.

In one method of manufacturing synthetic yarn, such as viscose rayon,after extrusion into a spin bath and after suitable aftertreating, theyarn is fed into what is known in the art as a spinning pot. Thisspinning pot comprises a cylindrical housing rotatably mounted on avertical axis and having an opening at the upper end into which the yarnis fed. By the action ofcentrifugal force the yarn is urged against theinner vertical wall surface of the pot and collected in cake form. Thespinning pot is manufactured from metal, such as aluminum, and, in orderto prevent corrosion, usually is coated with a lacquer over the, exposedsurfaces thereof.

Upon completion of cake formation, rotation of the pot is discontinuedand the cake is removed therefrom. In order to dislodge the cake fromwithin, the pot must be inverted, with the open end extendingdownwardly,

and struck forcibly against a solid object, such as a table top orportions of the spinning machine framework. Repeated striking of thespinning pot against a solid object results not only in rupture of theaforesaid lacquer surface coating but also results frequently inchipping and other damage to the top rim at the open end of the metallicpot.

In order to obviate this rim damage, it has been pro posed to form abuffer ring from a laminated material composed of an artificial resinand a fabric and to attach this ring to the top rim of the spinning pot,with a portion of the ring overlapping the top rim and extendinginwardly of the pot. The very nature of this type buffer ring isundesirable from an economical standpoint since the ring must beaccurately machined to precise dimensions comparable to and compatiblewith those of the spinning pot. Furthermore, the resiliency of this typebuffer ring is relatively low resulting in early and certain damagethereto and frequent replacement. Moreover, this ring affords much lessprotection to the pot during cake removal than that afforded by onewhich is more resilient, resulting in occasional pot damage even whenthe same is provided with a buffer ring.

It has now beenfound that the buffer rings remain undamaged over alonger period of use and that consequently the useful life of thespinning pots, that is, the period before replacement of the buffer ringand/or application of a new lacquer coating thereto is necessary, isincreased if the buffer ring consists of a flat elastic ring which isattached to the top rim of conventional spinning pots.

It is therefore an object of the present invention to pro-- vide aspinning pot with a buffer ring not having the disadvantage of knownexpedients.

It is another object of this invention to provide a spinning pot with abutler ring which is more elastic than known rings and less susceptibleto damage during the practice of conventional cake removing processes.

7 2,935,837 Patented May lO, 1960 Still another object of this inventionis to provide a buffer ring which affords better protection of thespinning pot against damage during the removal of a cake therefrom. i

In accordance with the present invention an elastic ring, preferablyfiat, is glued or otherwise attached to the top rim or upper surface ofthe spinning pot. For purposes of this discussion, it is intended thatthe term elastic include natural rubber, synthetic rubber or any othermaterial having substantially the same resiliency as rubber, especiallya sponge-like coating applied to an artificial base such as polyvinylchloride, polyamides, polyesters or polyurethanes.

- Other objects and advantages will become apparent from the'followingdetailed description taken in conjunction with the drawing, whichillustrates an elevational view, in section, of an embodiment of thepresent invention as applied to a conventional spinning pot.

In the single figure, an aluminum spinning pot of the usualconfiguration is represented by reference numeral 10. In order toprevent corrosion of the aluminum by the acid carried along with theyarn to be wound, the spinning pot 10 is provided over its entireexposed surface with a lacquer coating 11. On the top rim 12 of thespinning pot there is adhesively attached a buffer ring 13 of elastic orresilient material. As can be seen from the drawing, the inner surface14 of the ring is flat in order to conform to the outer surface of toprim 12 and the outer surface 15 is flat in order todistribute the impactor striking force to which the pot is exerted during cake removal.

The outer diameter of buffer ring 13 preferably is less than the outerdiameter of the pot 10. This protects the ring from damage duringhandling or cake removal in the spinning room. Moreover, the innerdiameter of the ring is greater than the maximum diameter of the yarncollecting inner surface 16 of pot 10 in order that presence of the ring13 on the pot will not hinder removal of the cake therefrom.

In applying a rubber ring in accordance with the teachings of thepresent invention, the adhesion of the ring to the top rim of thelacquered spinning pot may be improved considerably if the rubber of thering, or at least the surface thereof, is cyclized or roughened beforethe ring is glued onto the top rim.,

This cyclization may be carried out by treating the rubber ring at roomtemperature with a solution containing sulphuric acid for approximatelyone minute, after which the ring is washed with water and dried.

The adhesion of the rubber ring to the top rim of a spinning pot may beimproved still further by roughening the surface of the top rim to whichthe ring is attached. Also, in order to ensure a more permanentattachment, it may be advisable to provide adidtional glue to theboundary seam between the top rim and the ring after the initialapplication of glue has somewhat hardened.

Various kinds of commercially available glue or adhesive means may beused to attach the buffer ring to the top rim of the spinning pot. Ithas been found that a very satisfactory adhesion is obtained by the useof a glue having an epoxy resin base, such as commercially availableResiweld or Smooth-on, it being understood that the ring securing meansmust withstand striking forces 'exerted on the ring during cake removalas well as cen- 3 the lacquer coating if near the top rim of spinningpct 10 is obtained if the thickness of the buffer ring" amounts to atleast 2 mm. It is pointed out, however, that rings having a difierentthickness may be used with satisfactory results.

As a specific exam le", applicant attached a butter ring formed fromnatural rubber, which had been treated with a solution containing 80%sulphuric acid, washed' and dried, to the top rim of a spinning pot bythe use of a glue having an epoxy resin base. This ring protected thelacquer surface on and adjacent to the top rim of the spinning potagainst rupture usually caused by repeat ed blows inherent in the cakeremoving process and al'sn remained securely attached to pot 10 duringthe spinning process.

What is claimed is: I

Apparatus forcollecting synthetic yarn in cake form comprising acylindrical spinning" pot having a vertical ates 5,837

axis of rotation and a top rim provided with a flat outer to the flatouter surizace of said top rim.

References Cited in the file of this patent UNITED STATES PATENTS1,629,142 Bonell May 17, 1927 2,575,446 Gollong t Nov. 20, 1951 FOREIGNPATENTS

